From the New York Times:
In “The Honor Code,” we accompany Detective Appiah as he tries to figure out who killed three morally repugnant practices: dueling among British gentlemen, foot-binding among the Chinese elite and slavery in the British Empire. In each case he shows how notions of honor sustained the practice for centuries, and how (spoiler alert) it was honor that later killed the practice in just a few decades, making these cases the “moral revolutions” referred to in his subtitle.
I would argues that these "morally repugnant practices" have not necessarily been killed.
First, I would argue that morality is subject to fads, like fashion. Chinese foot-binders of yore, would be shocked and horrified by modern tattooing and piercing (and obesity!). No one expects tattooing, for example, to stay popular forever. Times change. Honor culture has changed as well, vestiges of the old system still survive in low class settings, but the upper classes still have their notions of honor. If you can’t find them, you’re not looking hard enough.
Second, I would argue that when something that has been with humans forever "goes away" you should be very skeptical. Slavery has been with human society since before there was human society. It would be truly astonishing if slavery disappeared. In most Western societies, I believe slavery still exists. What distinguishes modern slavery, from old-fashioned slavery is that modern slavery is administered by government (like many other things in modern times). Slaves are, by definition, dependent on their masters. Dependency and slavery are inseparable. It doesn’t take much looking these days to find people who are dependent on the government. If you are dependent, you are not free – you are a slave. We just choose not to call it that.